Table 2.
Comparison of ΔSGU values by Vita Classic guide and Vita Bleach Guide 3D-Master at different times. The median, minimum and maximum values are shown
| Assessment points | Color change by ΔSGU Vita Classical | Color change by ΔSGU Vita Bleachguide | ||||
|---|---|---|---|---|---|---|
| 37.5% Hydrogen Peroxide | 6% Hydrogen Peroxide | Mann-Whitney test* | 37.5% Hydrogen Peroxide | 6% Hydrogen Peroxide | Mann-Whitney test* | |
| Baseline vs. 1-wk after bleaching | 7 (2:9) | 6 (2:9) | 0.205 | 3.5 (1:6) | 3 (2:6) | 0.156 |
| Baseline vs. 1-mth after bleaching | 7 (2:9) | 6 (1:9) | 0.054 | 3 (1:6) | 2 (0:5) | 0.040 |
| Baseline vs. 6-mths after bleaching | 7 (3:8) | 6 (1:8) | 0.055 | 3 (2:5) | 2 (0:4) | 0.004 |
| Baseline vs. 12-mths after bleaching | 6 (1:8)** | 5 (0:7)** | 0.033 | 3 (0:5)** | 2 (0:4)** | 0.002 |
* for comparison between both groups in each assessment time; ** for comparison between two assessment time (1-month vs 12-month after bleaching) in each group. No significant difference was found (Wilcoxon test; p > 0.05).** for comparison between two assessment time (1-month vs 12-month after bleaching) in each group. No significant difference was found (Student t test for paired sample; p > 0.05)